// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

package store

import (
	"fmt"
	"os"
	"os/exec"
	"path"
	"time"

	"github.com/kumose/kmopt/pkg/utils"
)

// Syncer sync diff files to target
type Syncer interface {
	Sync(srcDir string) error
}

type combinedSyncer struct {
	syncers []Syncer
}

func (s *combinedSyncer) Sync(srcDir string) error {
	for _, sy := range s.syncers {
		if err := sy.Sync(srcDir); err != nil {
			return err
		}
	}
	return nil
}

func combine(syncers ...Syncer) Syncer {
	return &combinedSyncer{syncers}
}

type fsSyncer struct {
	root string
}

func newFsSyncer(root string) Syncer {
	return &fsSyncer{root}
}

func (s *fsSyncer) Sync(srcDir string) error {
	unix := time.Now().UnixNano()
	dstDir := path.Join(s.root, fmt.Sprintf("commit-%d", unix))

	if err := utils.MkdirAll(dstDir, 0755); err != nil {
		return err
	}

	files, err := os.ReadDir(srcDir)
	if err != nil {
		return err
	}

	for _, f := range files {
		if err := utils.Copy(path.Join(srcDir, f.Name()), path.Join(dstDir, f.Name())); err != nil {
			return err
		}
	}

	return nil
}

type externalSyncer struct {
	script string
}

func newExternalSyncer(scriptPath string) Syncer {
	return &externalSyncer{scriptPath}
}

func (s *externalSyncer) Sync(srcDir string) error {
	cmd := exec.Command(s.script, srcDir)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	return cmd.Run()
}
